Identity matrix

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Revision as of 14:44, 8 December 2008 by imported>Richard Pinch (mention Kronecker delta)
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In matrix algebra, the identity matrix is a square matrix which has all the entries on the main diagonal equal to one and all the other, off-diagonal, entries equal to zero. The identity matrix acts as the identity element for matrix multiplication. Its entries are those of the Kronecker delta.

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